Apparatus

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sensors Mode-S transponder

781F73

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-32ED · AIRBUS A-350-900

Hex
781F73
Octal
36017563
Decimal
7,872,371
Country
CN
Tail
B-32ED
Type
A359
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
204
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S 781F73.

Country allocation

The ICAO 24-bit address 781F73 falls within the block assigned to China (CN) by ICAO Annex 10, Volume III. Every aircraft registered in China receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
CSN346 - 28 2026-07-22
CSN345 - 24 2026-07-21
CSN674 China Southern Airlines 20 2026-07-26
CSN302 China Southern Airlines 20 2026-07-23
CSN349 - 13 2026-06-23
CSN673 China Southern Airlines 12 2026-07-26
CSN347 China Southern Airlines 12 2026-06-23
CSN306 China Southern Airlines 12 2026-06-12
CSN322 - 11 2026-07-12
CSN301 China Southern Airlines 10 2026-07-23
CSN350 - 7 2026-06-23
CSN348 China Southern Airlines 6 2026-06-24
CSN321 - 6 2026-07-11
CSN305 China Southern Airlines 6 2026-06-11
CSN316 China Southern Airlines 4 2026-07-21
CSN315 China Southern Airlines 4 2026-07-20
CSN382 - 2 2026-07-11
CSN6902 China Southern Airlines 1 2026-07-19
CSN3904 - 1 2026-07-07
CSN3903 China Southern Airlines 1 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSN674 LHR → PKX Jul 26, 20:15 UTCJul 26, 22:45 UTC2h 30m
2026-07-26 CSN673 PKX → LHR Jul 26, 06:45 UTCJul 26, 16:35 UTC9h 50m
2026-07-23 CSN302 SYD → CAN Jul 23, 20:35 UTCJul 23, 21:05 UTC30m
2026-07-23 CSN302 SYD → CAN Jul 23, 11:55 UTCJul 23, 19:45 UTC7h 50m
2026-07-23 CSN301 CAN → SYD Jul 23, 00:45 UTCJul 23, 09:10 UTC8h 25m
2026-07-22 CSN346 - Jul 22, 04:35 UTCJul 22, 04:50 UTC15m
2026-07-21 CSN346 - Jul 21, 20:05 UTCJul 22, 02:05 UTC6h 0m
2026-07-21 CSN345 - Jul 21, 09:40 UTCJul 21, 15:50 UTC6h 10m
2026-07-21 CSN345 - Jul 21, 06:35 UTCJul 21, 06:50 UTC15m
2026-07-21 CSN316 ICN → PKX Jul 21, 00:55 UTCJul 21, 01:30 UTC35m
2026-07-20 CSN315 PKX → ICN Jul 20, 12:40 UTCJul 20, 13:05 UTC25m
2026-07-19 CSN6902 PKX → URC Jul 19, 07:30 UTCJul 19, 15:20 UTC7h 50m
2026-07-19 CSN346 - Jul 19, 04:30 UTCJul 19, 04:45 UTC15m
2026-07-18 CSN346 - Jul 18, 20:10 UTCJul 19, 02:00 UTC5h 50m
2026-07-18 CSN345 - Jul 18, 10:15 UTCJul 18, 16:35 UTC6h 20m
2026-07-18 CSN345 - Jul 18, 07:15 UTCJul 18, 07:25 UTC10m
2026-07-18 CSN316 ICN → PKX Jul 18, 00:39 UTCJul 18, 01:00 UTC20m
2026-07-17 CSN315 - Jul 17, 12:19 UTCJul 17, 12:50 UTC30m
2026-07-16 CSN346 - Jul 16, 04:50 UTCJul 16, 05:05 UTC15m
2026-07-15 CSN346 - Jul 15, 20:10 UTCJul 16, 02:20 UTC6h 10m
2026-07-15 CSN345 - Jul 15, 06:40 UTCJul 15, 16:10 UTC9h 30m
2026-07-14 CSN302 - Jul 14, 20:00 UTCJul 14, 20:20 UTC20m
2026-07-14 CSN302 - Jul 14, 11:45 UTCJul 14, 19:15 UTC7h 30m
2026-07-14 CSN301 - Jul 14, 00:35 UTCJul 14, 09:05 UTC8h 30m
2026-07-13 CSN302 - Jul 13, 20:35 UTCJul 13, 20:55 UTC20m
2026-07-13 CSN302 - Jul 13, 12:00 UTCJul 13, 19:55 UTC7h 55m
2026-07-13 CSN301 ZGN → SYD Jul 13, 00:45 UTCJul 13, 09:20 UTC8h 35m
2026-07-12 CSN322 - Jul 12, 00:25 UTCJul 12, 09:05 UTC8h 40m
2026-07-11 CSN321 - Jul 11, 13:50 UTCJul 11, 22:15 UTC8h 25m
2026-07-11 CSN382 - Jul 11, 08:30 UTCJul 11, 09:00 UTC30m
2026-07-11 CSN382 - Jul 11, 00:20 UTCJul 11, 07:45 UTC7h 25m
2026-07-10 CSN381 ZGN → BNE Jul 10, 13:40 UTCJul 10, 21:30 UTC7h 51m
2026-07-09 CSN302 - Jul 9, 20:25 UTCJul 9, 20:45 UTC20m
2026-07-09 CSN302 - Jul 9, 11:45 UTCJul 9, 19:35 UTC7h 50m
2026-07-09 CSN301 - Jul 9, 00:40 UTCJul 9, 09:00 UTC8h 20m
2026-07-07 CSN3110 - Jul 7, 16:00 UTCJul 8, 01:30 UTC9h 30m
2026-07-07 CSN3904 - Jul 7, 13:55 UTCJul 7, 14:05 UTC10m
2026-07-07 CSN316 - Jul 7, 01:00 UTCJul 7, 01:20 UTC20m
2026-07-06 CSN315 - Jul 6, 12:35 UTCJul 6, 12:55 UTC20m
2026-07-06 CSN674 LHR → PKX Jul 6, 05:25 UTCJul 6, 05:40 UTC15m
2026-07-05 CSN674 LHR → PKX Jul 5, 20:30 UTCJul 6, 02:55 UTC6h 25m
2026-07-05 CSN673 - Jul 5, 06:40 UTCJul 5, 16:35 UTC9h 55m
2026-07-05 CSN316 - Jul 5, 00:40 UTCJul 5, 01:05 UTC25m
2026-07-04 CSN315 - Jul 4, 12:50 UTCJul 4, 13:20 UTC30m
2026-07-04 CSN674 LHR → PKX Jul 4, 05:10 UTCJul 4, 05:25 UTC15m
2026-07-03 CSN674 LHR → PKX Jul 3, 20:20 UTCJul 4, 02:45 UTC6h 25m
2026-07-03 CSN673 - Jul 3, 10:00 UTCJul 3, 17:00 UTC7h 0m
2026-07-03 CSN673 - Jul 3, 06:45 UTCJul 3, 06:55 UTC10m
2026-07-01 CSN346 - Jul 1, 20:10 UTCJul 2, 01:55 UTC5h 45m
2026-07-01 CSN345 PEK → AMS Jul 1, 06:40 UTCJul 1, 16:20 UTC9h 40m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the B-32ED page for operator, model, and routing details .

Mode-S 781F73 frequently asked

What is Mode-S code 781F73?
781F73 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-32ED.
Where is Mode-S 781F73 registered?
Mode-S code 781F73 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781F73 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781F73, octal 36017563, decimal 7,872,371.
What flights does 781F73 operate?
Mode-S 781F73 has broadcast 20 distinct callsigns, including CSN346, CSN345, CSN674, CSN302, CSN349.